![]() Adding artificial center tap and heater elevation 8. Increasing first filter cap from 20mf to 30mf 6. But to do that even, I would have to change the power transformer or add a small filament transformer somewhere to augment as the 40-18100 PT only delivers 1.1 amp (and it runs pretty hot even with the one 12AX7 and two 6AQ5's I used). Changing tone control to bass frequency weighted tone tilt stack ala Blencowe 5. There is a simple slider on/off switch, one knob for volume, one for tone. The Fender Musicmaster Bass Amp is a 1970s silverface combo amp designed to pair with the student-level Musicmaster bass guitars of the day. Laid out simply, the amp produces twelve watts with either 6v6 or 6aq5 preamp tubes. I too have left plenty of room on the board for further modification but, in my case, because I started with a little Acoustic G-20 as the donor amp, my chassis would be the more limiting part for me to expand should I later decide to redo with added tubes (as well as the space around the speaker when mounted in the cabinet). The Musicmaster Bass amp is a great way to get good tone from an honest vintage Fender tube amp without needing to take out a bank loan. I built one last year, but mine was only slight modded from the original, So I used the solid state rectifier and the replacement transformer set for the Musicmaster from Classictone (PT = 40-18100, OT = 40-18101, Driver = 40-18093). In the end I think the MusicMaster has a def 'cool factor' compared to the Jr. The MM is a fun amp but it is what it is. Though that's tough to say, as my favorite amp seems to change with each one I play as I'm playing it, it becomes my favorite. 'Vintage' Fender amps look and sound cool for the most part and are def fun to have around. Out of a small collection of silver face Fender amps the Musicmaster Bass may be my favorite. ![]() What power transformer is being used? I see that you have modded yours using a different one as you have switched to one that supports a 5V rectifier tube. There are a couple of mods you can do to these amps to really wake them up. ![]()
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